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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a7ecc91d1bf050b69dba48427b0a923a6d5d162bca6f5e19d57d4a4a927f5b' 
  AND token = 'oLF1SRjd9m6HZLP0bRovWc0PUMBSRHsZoLTeNipgmPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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