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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc129dad0132f95792ae2223441a8da5daf29bac8e88bcdeb9f013839d5431f' 
  AND token = '1m1lu6bil5micG3vmhgO8huVAIeFVRmimA9uK/HPhgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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