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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f1bcc4cfed1c7d87b6859fefa8c3064076d34e05f94a7c68f526e2ceb2689b' 
  AND token = 'pNC1WCR8HRV6HvCgBitsoJUXKSqkMGl+zNkr7N6XsKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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