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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63da281f0c5acecf96124ae07ec05a7243e6447a4a7e30c21ef477c6eaaceb87' 
  AND token = 'j9Mq2hUDnMnEtayEWO7ubCIaNEPM3tZkhlsGgfai7Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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