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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266b19448f0ce400d078ca4e475ee0e911bc19e5c2c57a87400670f7d382c09b' 
  AND token = 'MG8WNMq69E6wULfuThik+O49oEW5nspyOoB+ou8FpKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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