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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7299928084509bb84113ec1876663e2a06ad6e034a126a87529483c90bb3a285' 
  AND token = '5ffmZoTPWaFLOKuVNLpAJNkwBRG0C+khm2Kx0Ih7G20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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