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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7af83294174d4a2582ae23fdd908739ad8eaf86f93798a0830a06e777f842e' 
  AND token = 'A/jyjx11+XPg7JPGTUAY8dxWRNZJ+Ek3OPVM0drLkac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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