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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7edc463f92c0bc6ff674ad1f17ac27b1f809f538645cdf83b1deaecff3a5063' 
  AND token = 'mPQGD5EN92vJbQTxS2I/MAeyF39V78wmN2efS9yx1B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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