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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c26bc7572c4eb0b146a29256a29d3e96f68dbbefc0222e89a0740b9c6fe685' 
  AND token = 'QrXO8Yy69qjHCU2jZQ0XVMD6hFNMykQIrvYReKEn9Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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