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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6d8dda9b6b01104e70b7f8aa89494f317061429a235798eecf2f3b6bfc9695' 
  AND token = 'WI+71dTTRMPsFS5nCkuex2KRzqQlzJZuk7MGqpqQwaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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