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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b201cc18a73a93a1284c2b5e50c78b49270f8b26c0b44b7c53d65cf196e4354' 
  AND token = 'Zd/do+3M0lOE6c9rsupD2M5dA+6DJqf15dKEXAZqoR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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