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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c75a8d683ab6b90ce7bd4f037a8df125d10fba1c14e8655359bffa8bf0978ed7' 
  AND token = '2GpIlCJv9808sOJYQ5oeqK+f1Wq2G9Ciblt+yYriYWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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