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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e51047d47d6b78270e752455293abfbf69b750840f0cbcb6698557a46fa10d74' 
  AND token = '9++iAOkl/oNkgsuTqXvGYbglNlcuEXc8EzBnl5BQOfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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