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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6e894eb40bd06457c517d57d51196d15dcbd301d9ea80bee3f317ac67c009c' 
  AND token = 'M+XtHVde/IOxSKfqsWlvR57RpzX3VgIgznokLG/rd3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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