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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c5f160c5f545c9e862fb189f2fecc9d9a33ed63ae07bc67ef00caf35cc5af35' 
  AND token = 'V0t8tMrqPmBeLNrRL4hVFzOjo64+3NRBs10x4F4qVMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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