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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44984039bc304909816f638c7646bf264ec029ec141ab3b3b759976ddc8f0eb9' 
  AND token = 'NMMM415Xg1Zh25p0iFxV/ZTrmcp0Y+JJ+24KbCKyiy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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