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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584adacacae01f36085a8d25c75e72e9b442f54699003218b494512f350c9e94' 
  AND token = 'fqMGrwxZIWEvKIy9ZMd1349irfV8pxPiMHxhEeqijso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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