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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c42b27ca62f52bd7e1b810f87c9302047b74419e0e9f7b34bb9093ddc5221d' 
  AND token = 'HS0bVioI82DZ24dsbavMoCRgXCF1z6HhGO+yU4qFktA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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