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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '310db6e4d47bf1fb78acf06d5f43179ac8d869428127fb815fcbce071a337525' 
  AND token = 'rgsS03hablGCDx3jP35oxNzEZupCInFBb5rKkYsD2Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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