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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f95dc6228c0216ebbfcd02fe7eaf533d9bc9a2b4232992c7ea073abe61c332' 
  AND token = 'pGEeqwYBeynTK2LV5UfzGAZcy6HKzjGmcaSnX5US4BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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