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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04750f1f6ef7e61f6b516194c921baa1d34fe03204a164624cc3cd9c15185e6e' 
  AND token = 'mc8iVEmmA90bJgm7Batsh6doiwDHOY4eQiHy9OBs+jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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