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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2389f21a7eb2d879d8c2c676d4e43da0779b31afd37989846064b7cd6e2fc601' 
  AND token = 'mJ4iPhExdU8fvDxrBsPP8Aiid5Sw8+sOus8/7hayVFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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