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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ae02575262229a16f94185c13c2971e0a2e5095701d08d4eaf9545e6cdff2a' 
  AND token = 'SWoX/XGHXuJxx5Yi7i1yFh66/+UgIiHlrs2Rmg23PFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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