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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86af4e736b7a39bc5d058359c2dcfb88cea467c87567f0976f3a4637f7b072b8' 
  AND token = 'EnAqpIVdxbVpZWCeUCD0j6FuJa8mb8tX30TmDgcUdwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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