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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb81a8e52214fc9dfc03c906a2934a8fa0e2e94b9d922ef3c028832e513476e' 
  AND token = 'yygkqFXX+yGHvwqwr73or5CTasaUs/FextDYlZHgjNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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