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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e4cc0eccd49926a011ae3907fd0e06eef742b4f69a1011638217dee4fcb3e2' 
  AND token = '1y+TMY2zTt4Ec7XHnpgZCBtNu7dMucD1e0MgPdVRFvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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