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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c97edc78ada72fc75d634f0b81e3a6e9a218a4a7f238bc17eb31071a363feb5' 
  AND token = 'QdYwT46xLbs9GH2g2HpztYemS3g04Mvr0dDoBPgRuZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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