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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfea7b6b0771c4ff62afd9c5b0220e57a9c09beb1122d58cfa623aec1814191d' 
  AND token = 'kL6bcSbZ4Mf9jqfxgQaB2VxNIN7QLvVT8rD6HdAQe0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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