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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7fdac6026a96fed332476b602ad9a92149b91ac8f3106906f99092f5432515' 
  AND token = 'iUeO5dBDt/zcTuPfXng5InuyzTl+5ijXSVB1ZEFsPAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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