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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ea6e503ea1d9e42078ab2bd34792b043d02deda22abac2671a44577d44b9ea' 
  AND token = 'DW/88hWm1gqzrK1f/GOx8hfA/m5b+9egsmi++aSJdM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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