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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8551abc5c15a1f7f77e76a99d0cf0a0e0f7bff65b70f3c230acf5203404c36a5' 
  AND token = 'UXRZSZ3o4dwN1RysE3DWmN7dg5jtTU1CbYj6Z/k95J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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