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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef989fd09b8334bcf93fafb26bf53b9c06be4ae29ace1fd4d97ee896b12fc94' 
  AND token = 'GXqk2H4pO1AorgZTlVPHmko5fddAUfguwkkeZb97f3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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