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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28dab2634bcbc82a42c27829d749145ecacb9aa2e71126cee26d418fc20c943a' 
  AND token = '8cal5/WvI2Ifv4z+gwsJ872sLuIT+Oj2tZ3kSMuuCy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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