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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03deae05d033c25e14db84e6c562ef0a79a213a6622413fea8c4aedd85c1deb5' 
  AND token = '5y9kOsT49R6kfPKu9vMF2RcDB0+eP9Hpi/20tCCsSsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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