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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e975d0b63f3ed3f77e287dd2c90878982e7418c5d8a0188deedddc07299562d8' 
  AND token = 'OzD6GXIVJ1d9idUEV3YIQasSa9fXZbO5O4rsHInVX1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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