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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c7603d959f766bd8ea81fff2cb12a5dcdcc94a4b79ba439f8ffdba759d2b13' 
  AND token = 'g3NF1Nd05MYPIgFtAU6BafgB3qN3CEVGibKiqAHuyBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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