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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8b18e84895c3465d9a6fbe73b33f29374dc2f93f9bed3451148b379d0c22e0' 
  AND token = '6WWQMa01OzT+dVqgpR7S5myXoZCopEFIvqC2SVMrzzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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