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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88bf1f1e0fa4085555653991d93c766f9472973995854c271925e172663f4e2d' 
  AND token = 'lPobxd1I1EMTDvEIHa9KQ9kJLdPFbZu6uXf9xCE1Dls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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