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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4688fbf1fc0fa5defa629034666ffb5ba8d7fe7f15cb869edeef7ee83aff4f' 
  AND token = 'tPIGVmFjKq3nJOoTVtupiLqW9BOYJPq35eNkMTx3Hk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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