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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9402e78408bdd4158dbcf18dda041fa4c8d05f822c344f554306ca1cd6a19ee' 
  AND token = 'BN6Pr0UFc1rQdGLyuP+Ck8kx9IITI297o9xc7jjjwN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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