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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90bafbf7f4259cc268b93e88ed7e53a08e4427132c1d89f9d9dcdb4481debed6' 
  AND token = 'HwH87oHGruMGdPVjN+oA5XmAcBzChXBv90TJXhhA0jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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