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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3294ff315876a50bc9d054b1ad1bb6cd52edcd51b73af2f21c5e2a50dced1322' 
  AND token = 'XTWpen7G0EACL4AirGB4OQS7uMoRsUfgX9GTet628HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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