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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b523ffb0dfb2ffaadd9116459ea7f922998f206e642998bca15ca1b6f20cf4f' 
  AND token = 'Sba86rSD4f0/cIiovmgJRotZRCjQPwY3g9ox2J4S4WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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