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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7cdae8727cef218de97b2e67c102c926f2f911abf7aa600e9c1d467d85a70b9' 
  AND token = 'O1EJMi4OHEc60ilITv9uNDL/C3flFM4/QqyZwWWhTw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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