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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e3b347f8f959e37fcd9bc44c0cf0ef355563c23a6d90095de4977051958fb4' 
  AND token = 'IVO5dlkU7Ri87PJxMhPbIEttRVQLhW0Iisjrr8OQJJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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