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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf1583f74478af245536cfc26b7c1e9b57ab237e53118e622913dc2913572f4' 
  AND token = 'n7Jp/l92F17vAIj6lXPxugFICL5SLzjVFIb9FiesypA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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