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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '866cd2900338dc8b3b5b9ef8af34e458955ee914df610c3bf4e29b46008c569c' 
  AND token = 'jd9l/Riw29f0+R03KJg8gn77+Ic4dy73dFPlF9EaDYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}