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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a890ff5aabe81f1dc07f316c4c8ea8f96ea4f7bab635546485a502e88bec95eb' 
  AND token = 'FYjWuYFXQm79VO5ItSIKvdzjA7cMGNjzQfZDinS5PpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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